5.3.1 HEUB
The heat exchange unit type B (HEUB) provides power for the fan assembly, monitors the status
of the fan assembly, collects the cabinet environment monitoring information and power surge
protection alarm information, and reports the collected information to the BBU.
Panel
Figure 5-4 shows the HEUB panel.
Figure 5-4 HEUB panel
(1) ELU
(2) ExtFAN (3) IntFAN
(4) TEM (5) AC_SPD (6) GATE
(7) COM_IN (8) COM_OUT (9) PWR
Functions
The HEUB performs the following functions:
l Provides -48 V DC power to the fan assembly.
l Collects the cabinet environment monitoring information.
l Collects the surge protection alarm information of power equipment when AC power is
used.
l Monitors the running status of fans and supports fan speed adjustment based on temperature
or controlled by the BBU.
l Reports collected information to the BBU.
Ports
Table 5-2 describes the ports on the HEUB.
BTS3900C (Ver.C)
Hardware Description 5 BTS3900C Monitoring System
Issue 03 (2013-05-27) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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